0
n - 1
D = --------
r
where:
D = dioptric power of the surface,
n = the index of the material that the surface is made from,
r = the radius of curvature of the surface, in meters
and where the surface is in air.
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∙ 11y ago
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Why a small focal length convex lens is used in simple microscope?
because manifying power has inerse relation with that of focal length
Which lens has a greater power convex lens of focal length 10 cm or a convex lens of focal length 20cm?
Power is inversely related to the focal length. So convex lens of focal length 20 cm has less power compared to that having focal length 10 cm
What is the power of a plane mirror?
Power is ZERO Since power = 1/ focal length As focal length of plane mirror is infinity, its reciprocal is 0
What will be the power of convex lens having a focal length is 50 cm?
Convert the focal length to meters, then take the reciprocal. That is how the "power" of a lens is calculated.
What is the power of a convex lens with 10cm focal length?
1.0 diopters
Why a small focal length convex lens is used in simple microscope?
because manifying power has inerse relation with that of focal length
Why is power is used as reciprocal of focal length?
The tendency to converge the rays decides the power factor. So shorter the focal length converging is tremendous. Hence power is reciprocal of focal length
Which lens has a greater power convex lens of focal length 10 cm or a convex lens of focal length 20cm?
Power is inversely related to the focal length. So convex lens of focal length 20 cm has less power compared to that having focal length 10 cm
If the primary mirror of a telescope have a focal length of 225 centimeters and the eyepiece has a focal length of 7.5 millimeters then what is the magnifying power of the telescope?
The magnifying power of a telescope is the focal length of the scope in millimeters, divided by the focal length of the eyepiece in millimeters. Focal length of scope: 225cm=2250mm Focal length of eyepiece: 7.5mm 2250/7.5= 300X
What is the power of a plane mirror?
Power is ZERO Since power = 1/ focal length As focal length of plane mirror is infinity, its reciprocal is 0
What is power of plane glass sheet?
it is zero . Power = 1/focal length The focal length of a plane glass or mirror is infinite, therfore power is zero
Which lens provides more magnification-a low power or a high power?
A lens of short focal length has a greater power (than a lens of large focal length)
What will be the power of convex lens having a focal length is 50 cm?
Convert the focal length to meters, then take the reciprocal. That is how the "power" of a lens is calculated.
How do you find the power of lenses using focal lengths?
Power (F)= 1/focal length (f) focal length f, is measured in meters the power, F, is in dioptres (D) In converging or convex lenses the power is positive In diverging or concave lenses, the power is negative :)
What is the power of the eyepiece?
The magnification, or power, at which a telescope is operating is a function of the focal length of the telescope's main (objective) lens (or primary mirror) and the focal length of the eyepiece employed.
How do you find power of a power?
The power of a lens is 1/focal length (measured in meters).
What is the magnification of a reflecting telescope with an eyepiece of focal length 25 mm and an objective lens of focal length 2000 mm?
That's 80 power.
